MediaStreamTrackGenerator - Web APIs | MDN
Constructor
MediaStreamTrackGenerator()Experimental Non-standard-
Creates a new
MediaStreamTrackGeneratorobject which accepts eitherVideoFrameorAudioDataobjects.
Instance properties
This interface also inherits properties from MediaStreamTrack.
MediaStreamTrackGenerator.writableExperimental Non-standard
Instance methods
This interface doesn't implement any specific methods, but inherits methods from MediaStreamTrack.
Examples
The following example is from the article Insertable streams for MediaStreamTrack, and demonstrates a barcode scanner application, which process barcodes and highlights them before writing the transformed frames to the writable stream of MediaStreamTrackGenerator.writable.
js
const stream = await getUserMedia({ video: true });
const videoTrack = stream.getVideoTracks()[0];
const trackProcessor = new MediaStreamTrackProcessor({ track: videoTrack });
const trackGenerator = new MediaStreamTrackGenerator({ kind: "video" });
const transformer = new TransformStream({
async transform(videoFrame, controller) {
const barcodes = await detectBarcodes(videoFrame);
const newFrame = highlightBarcodes(videoFrame, barcodes);
videoFrame.close();
controller.enqueue(newFrame);
},
});
trackProcessor.readable
.pipeThrough(transformer)
.pipeTo(trackGenerator.writable);